	US 12,132,231 B2
	Layered structure for a fuel cell and method for producing a layered structure of this type
Gerold Hübner, Braunschweig (DE); Tanja Graf, Braunschweig (DE); and Thomas Schladt, Braunschweig (DE)
Assigned to VOLKSWAGEN AG, Wolfsburg (DE); and AUDI AG, Ingolstadt (DE)
Appl. No. 17/266,518
Filed by AUDI AG, Ingolstadt (DE); and Volkswagen AG, Wolfsburg (DE)
PCT Filed Jul. 8, 2019, PCT No. PCT/EP2019/068221 § 371(c)(1), (2) Date Feb. 5, 2021, PCT Pub. No. WO2020/030355, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 10 2018 213 148.1 (DE), filed on Aug. 7, 2018.
Prior Publication US 2021/0305589 A1, Sep. 30, 2021
Int. Cl. H01M 8/0234 (2016.01); H01M 4/86 (2006.01); H01M 8/0239 (2016.01); H01M 8/0243 (2016.01); H01M 8/0245 (2016.01); H01M 8/1004 (2016.01); H01M 8/10 (2016.01)

CPC H01M 8/0234 (2013.01) [H01M 4/8605 (2013.01); H01M 4/8642 (2013.01); H01M 8/0239 (2013.01); H01M 8/0243 (2013.01); H01M 8/0245 (2013.01); H01M 8/1004 (2013.01); H01M 2008/1095 (2013.01)]

7 Claims

1. A layered structure for a fuel cell, comprising:

a carbon-based catalyst-free gas diffusion layer substrate; and

a carbon-based microporous layer joined to the gas diffusion layer substrate,

wherein the carbon-based microporous layer includes a plurality of carbon carriers or carbon fibers embedded into an ion-conducting polymer binder mixture, and

wherein the polymer binder mixture includes a sulfur-free binding polymer and a sulfonated polymer, and a fraction of the binding polymer at or near a surface of the microporous layer that faces away from the gas diffusion layer substrate is less than or equal to a fraction of the sulfonated polymer,

wherein the fraction of the binding polymer in the microporous layer increases in the direction of the gas diffusion layer substrate, and the fraction of the sulfonated polymer decreases in the direction of the gas diffusion layer substrate, and

wherein the fraction of the binding polymer increases continuously in the direction of the gas diffusion layer.